An additional test for MDEV-21743 Split up SUPER privilege to smaller privileges

Adding a test to check that having a user with REPLICATION SLAVE
privilege is enough to run replication.

Made by Serg.

mysql-test/suite/rpl/r/grant_replication_slave.result

+#
+# MDEV-21743 Split up SUPER privilege to smaller privileges
+#
+create user rpl@localhost;
+grant replication slave on *.* to rpl@localhost;
+include/master-slave.inc
+[connection master]
+connection slave;
+stop slave;
+change master to master_user='rpl';
+connection master;
+create database mysqltest1;
+create table  mysqltest1.t1 (a int);
+insert mysqltest1.t1 values (1),(2),(3);
+select * from mysqltest1.t1;
+a
+1
+2
+3
+flush tables;
+create user foo@localhost;
+grant select on *.* to foo@localhost;
+connection slave;
+start slave;
+connection master;
+connection slave;
+select * from mysqltest1.t1;
+a
+1
+2
+3
+show grants for foo@localhost;
+Grants for foo@localhost
+GRANT SELECT ON *.* TO `foo`@`localhost`
+connection master;
+drop user foo@localhost;
+drop database mysqltest1;
+connection slave;
+stop slave;
+change master to master_user='root';
+start slave;
+include/rpl_end.inc
+drop user rpl@localhost;

mysql-test/suite/rpl/t/grant_replication_slave.test

+--echo #
+--echo # MDEV-21743 Split up SUPER privilege to smaller privileges
+--echo #
+
+# Checking that REPLICATION SLAVE is enough to start replication
+
+create user rpl@localhost;
+grant replication slave on *.* to rpl@localhost;
+
+source include/master-slave.inc;
+connection slave;
+stop slave;
+change master to master_user='rpl';
+connection master;
+
+create database mysqltest1;
+create table  mysqltest1.t1 (a int);
+insert mysqltest1.t1 values (1),(2),(3);
+select * from mysqltest1.t1;
+flush tables;
+create user foo@localhost;
+grant select on *.* to foo@localhost;
+
+connection slave;
+start slave;
+connection master;
+sync_slave_with_master;
+select * from mysqltest1.t1;
+show grants for foo@localhost;
+connection master;
+drop user foo@localhost;
+drop database mysqltest1;
+sync_slave_with_master;
+stop slave;
+change master to master_user='root';
+start slave;
+
+source include/rpl_end.inc;
+drop user rpl@localhost;